/**
 * RelativeDateFormatUtils.java
 * Created at 2016年10月20日
 * Created by Jackie Liu
 * Copyright (C) 2016 Jackie Liu, All rights reserved.
 */
package com.huabo.utils;

import java.util.Date;

/**
 * <p>ClassName: RelativeDateFormatUtils</p>
 * <p>Description: 日期相对时间格式化</p>
 * <p>Author: Jackie Liu</p>
 * <p>Date: 2016年10月20日</p>
 */
public class RelativeDateFormatUtils {

	private static final long ONE_MINUTE = 60000L;  
    private static final long ONE_HOUR = 3600000L;  
    private static final long ONE_DAY = 86400000L;  
    //private static final long ONE_WEEK = 604800000L;  
  
    private static final String ONE_SECOND_AGO = "秒前";  
    private static final String ONE_MINUTE_AGO = "分钟前";  
    private static final String ONE_HOUR_AGO = "小时前";  
    private static final String ONE_DAY_AGO = "天前";  
    //private static final String ONE_MONTH_AGO = "月前";  
    //private static final String ONE_YEAR_AGO = "年前";  
  
    /**
     * <p>Description: 格式化日期</p>
     * @param date 日期对象
     * @return
     */
    public static String format(Date date) {  
        long delta = System.currentTimeMillis() - date.getTime();
        if (delta < 1L * ONE_MINUTE) {  
            long seconds = toSeconds(delta);  
            return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;  
        }  
        if (delta < 45L * ONE_MINUTE) {  
            long minutes = toMinutes(delta);  
            return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;  
        }  
        if (delta < 24L * ONE_HOUR) {  
            long hours = toHours(delta);  
            return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;  
        }  
        if (delta < 48L * ONE_HOUR) {  
            return "昨天";  
        }  
        if (delta < 30L * ONE_DAY) {  
            long days = toDays(delta);  
            return (days <= 0 ? 1 : days) + ONE_DAY_AGO;  
        }  
        return DateUtils.dateTimeToString(date);
        /*if (delta < 12L * 4L * ONE_WEEK) {  
            long months = toMonths(delta);  
            return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;  
        } else {  
            long years = toYears(delta);  
            return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;  
        }*/  
    }  
  
    private static long toSeconds(long date) {  
        return date / 1000L;  
    }  
  
    private static long toMinutes(long date) {  
        return toSeconds(date) / 60L;  
    }  
  
    private static long toHours(long date) {  
        return toMinutes(date) / 60L;  
    }  
  
    private static long toDays(long date) {  
        return toHours(date) / 24L;  
    }  
  
    /*private static long toMonths(long date) {  
        return toDays(date) / 30L;  
    }  
  
    private static long toYears(long date) {  
        return toMonths(date) / 365L;  
    }*/  
}
